Interchangeable sound conductor for phonographs



Dec. 15, 1931. R kE 1,836,324

' INTERCHANG-EABLE SOUND CONDUCTOR FOR PHONOGRAPHS Filed N0v.27, 1928 2 Sheets-Sheet 1 R. G. IAPADRE INTERCHANGEABLE SOUND CONDUCTOR FOR PHONOGRAPHS Filed Nov, 27, 19 28 2 Sheets-Sheet 2 Patented Dec. 15,1931

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ROSARIO e. mnnnnnor .n'nw xnzusmeron rnnnsYmvn-Nin INTERCHANGEABLE sounnoonnuoiron ron rnonoennrns Application filed Mamba-21m Serial in. 322,238.

This invention relates to phonographs, and'the general object is the provision of means whereby, using a double sound box, sound 'vibrations generated by both diaphragms may be carried either into a single tone arm and thus delivered to the usual resonant chamber of the phonograph or to the usual horn or whereby sound may be carried from one side of the sound box to the tone arm and from the other side to a small horn, or whereby the sound may be carried from this last named side of thesound'box to a telephonic transmitter of any suitable character and thus transmitted over any desired distance to a loud speaker or other likeunit for reproduction 1 A further object'is to provide a mechanism of this character which is very simple, which may be readily applied, an d'which permits by a slight adjustment any one of these arrangements to be made.

My invention is illustrated in the accompanying drawings, wherein Figure 1 is a top plan'view of a phonograph tone arm and record showing one arrangement of my sound conductor;

Figure 2 is a fragmentary plan view showing another arrangement of the sound conductor;

Figure 3 is an enlarged section on the line 88 of Figure 2; a 1

Figure 4 is a top plan view partly broken away of another arrangement ofthe sound conductor; 7

Figure 5 is a top plan View of the U-shaped tube 18; v

Figure 6 is a sectional view through a double sound box;

Figure 7 is a fragmentary elevation of the stylus supporting mechanism;

Figure 8 is an under side plan view thereof;

Figure 9 is a plan view of the annular filler for the sound box;

Figure 10 is a side elevation of the parts arranged as shown in Figure 2.

Referring to these drawings, it will be seen that I have illustrated a phonograph having the usual tone arm A communicating with a sound chamber (not shown) of any usual or suitable type. This tone arm swings horizontally across a phonographic record B in the usual manner and carries upon it the sound box This sound box, as illustrated in Figure'b, is provided "with the two side p1ates'10 and 11. The side plate 10 has an outwardly projecting, centrally disposed outlet socket 12,while the side plate 11 is also formed with a corresponding "socket 13. This soc'ket 13 is engagedbya U -sha-ped s-oundcon duotingtube 1 1, the inner end of which is inserted in thesocket and is engaged therewith by means of a bayonet joint 15. The other end ofthe tube 1&1 is inserted in the tubular head 16 of the tone arm A.

This head is open at opposite ends and is engaged at one end with the extremity of the lf'Jf-shap'ed-tube 1 1. This tube 14 at that end which is engaged with the head 16 is cut out at 145 and also notched at 14 The opposite end'of the head 16 is open for the reception of one end of a U-shaped tube 18, as illustrated in Figure ,1, the other end ofwhich is in sorted in the socket 12 of the sound box C and held by a set screw 18. This open end is also internally screw threaded for engagement by a'cap 17when necessary; k I

'fThat end of the tube 18 which is designed to be inserted within the head 16is cut away, asat 19, so that when inserted it will not obstruct the opening ofthe tone arm and is formed with a lug 19 This end is also adapted to receive an angular tubular arm or goose neck 20. One end of this goose nec'k adapted to be slipped over the extremity of the U-shaped tube 18 and to abut against the stop 21 and held in place upon the tube 18 means of the set screw 22. This angular tubular arm 20 or goose neckis 'adap'tedto be connected to the inlet of a horn 23, as shown in Figures 2 and 10. Thus while the sound vibrations are being transmitted to the tone arm A and thus to the sound chamber of the phonograph, sound vibrations will also be transmitted to the smut-om 23 which will reproduce the same music as the phonograph but with a metallic quality, or in other words a tone-which will be'very different from the usual tone of the phonograph;

, Figliie 4', I illustrate the double sound 1110 box C as being provided on one side with the U-shaped arm 2% leading to the tone arm and with a substantially S-shaped arm 25.

This arm at one end extends laterally and is provided with a sleeve 26 or rubber adapter adapted to engage in the socket 12 and the opposite end of this S-shaped tube extends laterally in an opposite direction from the extension 27, and is screw-threaded and closed by a cap 28. This lateral extension has an opening 29 and surrounding the lateral extension is a sleeve 30, to which is connected the inlet tube 31 of an electric sound trans mission mechanism such, for instance, as a telephone sound box or microphone 32 or other electrical reproducing unit, from which wires may be carried to any desired distance and to a loud speaker unit or the like reproducer.

This telephonic transmitter or microphone 32 is not shown in detail, as any form of telephonic transmitter may be used and it is shown as being supported by a plate 83 attached to a band 3-1 surroundin, the tone arm. ()bviously I do not wish to be limited to this particular means of supporting the telephonic transmitter, but this means permits the tone arm to swing back and forth across the record with the tone arm and sound box.

I do not wish to be limited to the particular character of the sound box shown, but I have illustrated a sound box having the double diaphragms 35, each diaphragm being operatively connected to a stylus carrier 36 in which the stylus 37 is mounted. There are two convergently connected stylus arms 38 each of which is angularly bent and extends through the center of a ring 39 and is connected to the corresponding diaphragm. The stylus carrier 36 has alined fulcrums 40 and adjustable, laterally projecting springs 41 and thus the vibrations of a record will be transmitted to both diaphragms and these sound vibrations will be transmitted either to the tone arm of the phonograph, partly to the tone arm and partly to the horn 23.

Or these sound vibrations will be transmitted partly to the tone arm and partly to the microphone or telephone transmitter 32. Preferably a spacing ring 42 will be disposed between the two rings 39.

Where a very loud volume is desired, both the tubes 14 and 18 may be used, both being connected to the tone arm 15 in the manner shown in Figure 1, in which case all of the sound vibrations will be transmitted to the tone arm and thence to the sound chamber of the phonograph. Obviously the tube 18 may be left off, if desired, and the extremity of the head 16 closed by the cap 17 and then vibrations from only one side of the sound box will betransmitted to the tone arm.

Under some circumstances as, for instance, in stores, shops or other places, it,,is desirable to transmit the music of the phonograph telephonically to loud speakers on an other floor or in another room or outside the building, then the apparatus shown in Figure 4 is used. Under these circumstances, the phonograph will be heard as usual in the store itself or room in which the instrument is located, while a reproduction of the phonograph Will also be heard in another room or in another part of the building or on the outside of the building.

I do not wish to be limited to the particular construction of the parts as these may be modified in many ways without departing from the spirit of the invention as defined in the appended claims.

I claim 1. In a phonograph, a tone arm having a head open at opposite ends, a cap adapted to close one end of the head, a U-shaped tubo'permanently connected to the other end of the head, adouble sound box having two diaphragms and two sound chambers exterior to the diaphragnis, one side oi. the sound box being connected to the U-shaped tube, a second tube adapted to be connected to the other side of the sound box and having its other end connected to a sound trans mitting instrument and supporting means for said instrument engaging said tone arm.

2. In a phonograph, a tone arm, a double sound box, a U-shaped tube connecting the double sound box to the tone arm, and means whereby the other side of the sound box may be connected to a sound transmitting instrument and supporting means for said instrument engaging said tone :1 rm.

In testimony whereof I hereunto afiix my signature.

ROSARIO G. IAPADRE. 

